A model to describe the distribution of photosynthetically active radiation in forests using 3D point cloud data

A technology of photosynthetically active radiation and three-dimensional point cloud, which is applied in the directions of utilizing re-radiation, re-radiation of electromagnetic waves, climate sustainability, etc., can solve the problem of failure to take into account the angular distribution of real elements of the canopy, the inability to accurately describe the three-dimensional space-time distribution, and the lack of Consider other issues

Active Publication Date: 2022-07-12
INST OF SOIL SCI CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

First of all, Bell's law is only applicable to the case of random distribution of elements, which has limitations
Second, the density of ALS data points is low, which cannot accurately describe the three-dimensional spatio-temporal distribution of forest canopy PAR
At the same time, since the photosynthetic efficiency of vegetation under diffuse PAR conditions is higher than that under direct PAR conditions, it is necessary to consider the transmission process of direct sunlight and diffuse PAR inside the canopy separatel

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  • A model to describe the distribution of photosynthetically active radiation in forests using 3D point cloud data
  • A model to describe the distribution of photosynthetically active radiation in forests using 3D point cloud data
  • A model to describe the distribution of photosynthetically active radiation in forests using 3D point cloud data

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Embodiment Construction

[0020] The present invention is further described below by specific examples:

[0021] Use the ground lidar scanner to obtain the point cloud data of the forest quadrature according to the technical solution step (1) ( figure 2a). According to the density of the plot, the sampling interval of the TLS was set to 1 cm at 10 m, and a total of 5 stations were set, one in the center and one in each of the four corners of the plot. Three locations were chosen to place targets for data stitching processing. After data acquisition, Cyclone software was used for splicing, and the central area of ​​the quadrat was cut out. Manually remove noise points from the data. Rotate the TLS data according to the reference point so that the y-axis is due north. The values ​​of solar incident direct PAR and scattered PAR were measured using a BF5 radiometer.

[0022] Calculate the direct PAR of each point according to the technical solution step (2), calculate the scattered PAR of each point ...

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Abstract

The invention provides a model for depicting the distribution of photosynthetically active radiation (PAR) in a forest by using three-dimensional point cloud data, which belongs to the research field of vegetation remote sensing modeling. Aiming at the problem that the three-dimensional distribution of forest canopy PAR cannot be effectively estimated by using lidar data on a fine scale at present, the present invention proposes a forest PAR three-dimensional spatiotemporal distribution estimation model based on the forest ground lidar data obtained from multiple stations. The model separately considers direct solar and scattered PAR transport in the forest, while taking into account the effects of element angles. The model constructed by the invention can quantitatively describe the three-dimensional space-time distribution of PAR in the forest on a fine scale, with high precision, which is helpful for the research on the physiological process of the forest.

Description

1. Technical field [0001] The invention is a model for depicting the three-dimensional space-time distribution of forest photosynthetically active radiation on a fine scale through three-dimensional point cloud data. Estimating the three-dimensional distribution of forest photosynthetically active radiation at any time belongs to the research field of vegetation remote sensing modeling. 2. Background technology [0002] Photosynthetically active radiation (PAR) refers to the part of solar radiation with a wavelength between 400-700 nm that can drive vegetation to carry out photosynthesis, and is an important environmental factor affecting vegetation photosynthesis and transpiration. The difference in PAR received by different positions of the forest canopy is obvious, and this difference changes with the change of the position of the sun. At the same time, the leaf photosynthetic speed has a nonlinear response to PAR. Therefore, the three-dimensional spatiotemporal distribut...

Claims

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Application Information

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IPC IPC(8): G01S17/88G01S17/89
CPCG01S17/88G01S17/89Y02A90/10
Inventor 马利霞于东升陈洋
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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